<button class="button">join now</button>

<style>
/* From Uiverse.io by escannord  - Tags: simple, button, btn */
.button {
  cursor: pointer;
  display: inline-block;
  width: 14rem;
  height: 4rem;
  border: solid 2px;
  background: linear-gradient(to right, #ff00ffb0, #ff9900a1, #ff00ff9f),
    radial-gradient(rgb(255, 255, 255), rgb(255, 0, 0));
  border-radius: 20px;
  font-weight: 800;
  position: relative;
  border-image: linear-gradient(to right, #5e005e, #804d00, #eb1beb);
  border-image-slice: 50;
}

.button::before {
  content: "";
  display: inline-block;
  position: absolute;
  width: 90%;
  height: 70%;
  border: 1px solid rgba(255, 255, 255, 0.384);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 8px;
  box-shadow: 0px 0px 0px 1px rgba(255, 255, 255, 0.575),
    inset 0px 0px 0px 0px rgba(255, 255, 255, 0.575);
}

</style>
    